linux-kernel - Re: [PATCH] irqchip: GICv3: ITS: Allocate enough memory for the full range of DeviceID

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Message-Id: <15CDAC06-1E2B-4545-93E8-CBB4B47E2707@kylinos.com.cn>
Date:	Tue, 27 Jan 2015 19:15:16 +0800
From:	Chen Baozi <chenbaozi@...inos.com.cn>
To:	陈鲍孜 <baozich@...il.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Marc Zyngier <marc.zyngier@....com>
Subject: Re: [PATCH] irqchip: GICv3: ITS: Allocate enough memory for the full range of DeviceID

On Jan 27, 2015, at 11:06, Chen Baozi <baozich@...il.com> wrote:
> 
> The ITS table allocator is only allocating a single page per table.
> This works fine for most things, but leads to silent lack of
> interrupt delivery if we end-up with a device that has an ID that is
> out of the range defined by a single page of memory. Even worse, depending
> on the page size, behaviour changes, which is not a very good experience.
> 
> A solution is actually to allocate memory for the full range of ID that
> the ITS supports. A massive waste memory wise, but at least a safe bet.
> 
> This patch has been tested on the Phytium SoC.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>

Failed to clarify that Marc is the author of this patch.

Sorry for the mistake.

Cheers,

Baozi.


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